I have rx7600 and a ryzen 7 3700x. And i get 100%gpu usage and 60-70% cpu usage. Only in this game. Every other gamr i have played its 100 and 20-30 usage
Try reinstalling the game once, also check if you have force enabled any setting in the AMD Adrenalin control panel. If anything is enabled, just turn it to default or just reinstall the amd adrenalin control panel and tick the reset to factory settings option.